I want there to be clouds in the sky, what i mean is like when you go to the highest skyscraper in the city, you are just above the clouds or something similar. Also i want to have alot of interaction with spidey's bedroom, so like he can go to sleep, interact with the posters on his wall etc. Another thing is to have to choose like what to say to citizens in the street or having to choose whether to be good or bad like in WoS, and this choice will have consequences further in the game. i absolutely hated WoS, it was the worst spiderman game ever!
I have always wanted to have random encounters with supervillains - or incorporate the villains into the open world somehow. For instance, I think the Chameleon would make a great villain in the open world - swinging around using spidey sense to check people out, following clues, etc...Also, it ould be wicked to be hunted, play a game of cat and mouse, by Kraven throughout Manhatten.
I don't think the Symbiote costume would be in there, because in the movie, he hasn't gotten there yet. They wouldn't put in the costume if it's in future "The Amazing Spider-Man" movies. In Spider-man for the Gamecube/PS2/Xbox the costume wasn't in there. They could put costumes like Cosmic Spider man and Ben Reilly and Scarlett Spidey though.